Equity - Stock Incentive Plans (Details)	12 Months Ended
Dec. 31, 2020 USD ($) plan shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans \| plan	2
Intrinsic value of options exercised	$ 1,900,000	$ 600,000	$ 7,900,000
Proceeds from exercise of stock options	411,000	108,000	3,555,000
Tax benefit from exercise of stock options	1,600,000	200,000	5,900,000
Fair value of options vested	$ 0	$ 1,400,000	$ 100,000
Granted (in shares) \| shares	0	0	0
Total unrecognized compensation expense	$ 0
All Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from exercise of stock options	$ 400,000	$ 100,000	$ 3,600,000
Modified Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term of equity grant (in years)	10 years
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant under the plan (in shares) \| shares	8,400,000
2016 Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Contractual term of equity grant (in years)	10 years
2016 Plan \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years

The number of share-based compensation the company maintains.

No definition available.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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